CN107091861A - A kind of device and method for measuring different depth water body resistivity under water - Google Patents

Abstract

A kind of device and method for measuring different depth water body resistivity under water, it is related to a kind of device and method for measuring water body resistivity, and in particular to a kind of device and method of measurement different depth water body resistivity under water.The present invention is in order to solve existing water body method of measuring resistivity on test achievement degree of accuracy influence and the problem of relatively low operating efficiency.The present invention includes first electrode, second electrode, 3rd electrode, 4th electrode, insulating bar, power supply, voltmeter and ammeter, first electrode, second electrode, 3rd electrode, 4th electrode is from top to bottom equidistantly sequentially arranged on insulating bar, first electrode is connected by wire with ammeter negative pole, ammeter positive pole is connected by the positive pole of wire and power supply, 4th electrode is connected by the negative pole of wire and power supply, second electrode is connected by the positive pole of wire and voltmeter, 3rd electrode is connected by the negative pole of wire and voltmeter, power supply, voltmeter and ammeter are arranged on mobile hull.The invention belongs to field of geophysical exploration.

Description

A device and method for measuring the resistivity of underwater water bodies at different depths

technical field

The invention relates to a device and a method for measuring the resistivity of water bodies, in particular to a device and a method for measuring the resistivity of underwater water bodies at different depths, and belongs to the field of geophysical exploration.

Background technique

From the use of water, there may be drinking water, agricultural water, industrial water, etc. Due to different uses, the requirements for water quality are also different. Water quality analysis plays a very important role in the national economy. The temperature and turbidity of water in large and medium-sized reservoirs and deep rivers are generally distributed in layers, so it is necessary to investigate and study water in different layers of reservoirs and rivers. Since water quality is related to water resistivity, measuring the resistivity of different water layers is one of the indispensable and important tasks in the field of water resource investigation.

At present, the method of measuring the resistivity of different water layers is to take water samples of different water depths on site, and then take the water samples to the laboratory for the water sample resistivity test. Due to the steps of sampling, sample transfer, and sample storage, the accuracy of the test and Efficiency will be affected.

The present invention can complete the resistivity test of water bodies at different depths on site. The invented test device is simple and easy to operate. It avoids many links such as sampling water bodies at different depths, sending samples to the laboratory, and laboratory tests, and avoids sample variation that may affect the accuracy of test data. The influence of sex can significantly improve the accuracy and work efficiency of the measurement result data.

Contents of the invention

In order to solve the problem that the existing water body resistivity measurement method affects the accuracy of test results and the work efficiency is low, the invention proposes a device and method for measuring underwater water body resistivity at different depths.

The technical scheme adopted by the present invention for solving the above problems is: the device of the present invention includes a first electrode, a second electrode, a third electrode, a fourth electrode, an insulating rod, a power supply, a voltmeter and an ammeter, the first electrode, the second The electrode, the third electrode, and the fourth electrode are installed on the insulating rod at equal intervals from top to bottom. The first electrode is connected to the negative pole of the ammeter through a wire, the positive pole of the ammeter is connected to the positive pole of the power supply through a wire, and the fourth electrode is connected to the positive pole of the power supply through a wire. The negative pole is connected, the second electrode is connected with the positive pole of the voltmeter through a wire, the third electrode is connected with the negative pole of the voltmeter through a wire, and the power supply, the voltmeter and the ammeter are arranged on the mobile hull.

The concrete steps of method of the present invention are as follows:

Step 1. Insert the insulating rod vertically into the water to measure the depth, and keep the first electrode, the second electrode, the third electrode, and the fourth electrode all submerged in the water, and record the water depth value of the current test position according to the scale on the insulating rod;

Step 2, turn on the power supply, read the readings of the ammeter connected to the output circuit of the power supply and the readings of the voltmeter connected between the second electrode and the third electrode and record them, and complete a single on-site measurement of a water depth position; in order to increase the measurement The accuracy of the data, the data displayed on the ammeter and voltmeter can be read and recorded multiple times at a depth;

Step 3. Repeat the above two steps to complete the on-site work of resistivity measurement at different underwater depths;

Step 4: Calculate the water body resistivity at each test water depth according to the field test record data obtained in the above steps.

The beneficial effects of the present invention are:

1. The present invention can complete the resistivity test of water bodies at different depths on site, eliminating the need for sampling water bodies, sending samples to the laboratory, laboratory tests and many other links, avoiding possible temperature, pollution, chromatography, etc. during the sample circulation process. The influence of physical and chemical disturbance factors improves the accuracy of data and work efficiency.

2. The structure of the device of the present invention is simple, only electrodes, power supply, voltmeter, ammeter, insulating rod and some wires are used, the device has few components, and it is convenient to go to the field for testing and carrying;

3. The invention is easy to operate, and the on-site installation of the test device is completed by connecting each device through a wire; during the test, the insulating rod is sent into the water, and the data of the depth of water, ammeter, and voltmeter are read and recorded, and the single point is completed. Test site work, only need 1-2 people to operate on site.

Description of drawings

Fig. 1 is a schematic structural view of the measuring device of the present invention.

detailed description

Specific Embodiment 1: This embodiment is described in conjunction with FIG. 1. A device for measuring the resistivity of underwater water bodies at different depths described in this embodiment includes a first electrode 1, a second electrode 2, a third electrode 3, and a fourth electrode 4. , an insulating rod 5, a power supply 6, an ammeter 7 and a voltmeter 8, the first electrode 1, the second electrode 2, the third electrode 3, and the fourth electrode 4 are installed on the insulating rod 5 at equal intervals from top to bottom, and the second An electrode 1 is connected to the negative pole of the ammeter 7 through a wire, the positive pole of the ammeter 7 is connected to the positive pole of the power supply 6 through a wire, the fourth electrode 4 is connected to the negative pole of the power supply 6 through a wire, and the second electrode 2 is connected to the positive pole of the voltmeter 8 through a wire connection, the third electrode 3 is connected to the negative pole of the voltmeter 8 through a wire, and the power supply 6, the voltmeter 8 and the ammeter 7 are arranged on the mobile hull 10.

Specific Embodiment 2: This embodiment is described with reference to FIG. 1 . The insulating rod 5 of a device for measuring the resistivity of underwater water bodies at different depths described in this embodiment is marked with scales along its length. Other components and connections are the same as those in the first embodiment.

Specific embodiment three: This embodiment is described in conjunction with Fig. 1, and a kind of method for measuring the resistivity of underwater different depth water bodies described in this embodiment is realized through the following steps:

Step 1. Insert the insulating rod vertically into the water to measure the depth, and keep the first electrode, the second electrode, the third electrode, and the fourth electrode all submerged in the water, and record the water depth value of the current test position according to the scale on the insulating rod;

Step 2, turn on the power supply, read out the output ammeter reading and the reading on the voltmeter connected between the second electrode and the third electrode and record it, and complete a single on-site measurement of a water depth position; in order to increase the accuracy of the measurement data, The data displayed on the ammeter and voltmeter can be read and recorded multiple times at a depth;

Step 3. Repeat the above two steps to complete the on-site work of resistivity measurement at different underwater depths;

Step 4: Calculate the water body resistivity at each test water depth according to the field test record data obtained in the above steps.

working principle

Assuming that the resistivity of the water body between the four electrodes in the device is the same, find that the output current of the first electrode 1 and the fourth electrode 4 is I, and the potential difference between the second electrode 2 and the third electrode 3 is ΔU. 1 and the resistivity ρ of the water body between the fourth electrode 4;

Because in the water environment, the electric field can be regarded as a uniform and isotropic full-space electric field, so the potential expression at the point electric field R in water is:

In the formula (1), UR represents the potential of point _R , I represents the output current value of the power supply, ρ represents the resistivity in the electric field, and R represents the distance between a certain point in the electric field and the point power supply;

According to formula (1), the potential expression of a certain point in water for the electric field of two opposite point current sources can be obtained:

In the _formula ( ₂ ), R1 represents the distance from a certain point in the field to the positive electrode, and R2 represents the distance from the point to the negative electrode;

In the present invention, because the distances of the four electrodes are the same, that is, the distances between the first electrode, the second electrode, the second electrode, the third electrode, the third electrode, and the fourth electrode are all L, the second electrode can be obtained by formula (2). The expression of potential U _a at electrode 2 is:

Similarly, the potential _Ub at the third electrode 3 is expressed as:

The potential difference ΔU between the second electrode 2 and the third electrode 3 can be obtained by formula (3) and formula (4):

From formula (5), the calculation formula of water body resistivity ρ can be obtained:

The above formula shows that as long as the current I passing through the first electrode 1 and the fourth electrode 4 and the potential difference ΔU between the second electrode 2 and the third electrode 3 are measured on site, the first electrode 1 and the fourth electrode 3 can be calculated. The resistivity ρ of the water body between the four electrodes.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but as long as they do not depart from the technical solution of the present invention, according to the technical content of the present invention Within the spirit and principles of the present invention, any simple modifications, equivalent replacements and improvements made to the above embodiments still fall within the scope of protection of the technical solutions of the present invention.

Claims (3)

1. A device for measuring the resistivity of water bodies at different depths underwater, characterized in that: said device for measuring the resistivity of water bodies at different depths underwater comprises a first electrode (1), a second electrode (2), a third Electrode (3), fourth electrode (4), insulating rod (5), power supply (6), ammeter (7) and voltmeter (8) leads, first electrode (1), second electrode (2), the The three electrodes (3) and the fourth electrode (4) are installed on the insulating rod (5) at equal intervals from top to bottom, the first electrode (1) is connected to the negative pole of the ammeter (7) through a wire, and the positive pole of the power meter (8) Connect with the positive pole of power supply (6) by wire, the 4th electrode (4) is connected with the negative pole of power supply (6) by wire, the second electrode (2) is connected with the positive pole of voltmeter (8) by wire, the 3rd electrode ( 3) Connect the negative pole of the voltmeter (8) through a wire, and the power supply (6), voltmeter (8) and ammeter (7) are arranged on the mobile hull (9). 2. A device for measuring the resistivity of underwater water bodies at different depths according to claim 1, characterized in that: the insulating rod (5) is marked with scales along its length direction. 3. A method utilizing the device of claim 1 to measure the resistivity of water bodies at different depths underwater, characterized in that: the method for measuring the resistivity of water bodies at different depths underwater is realized by the following steps: Step 1. Insert the insulating rod (5) vertically into the water to measure the depth, and keep the first electrode (1), the second electrode (2), the third electrode (3) and the fourth electrode (4) all submerged In water, record the water depth value at the current test position according to the scale on the insulating rod (5); Step 2, turn on the power supply (6), read out the reading of the output ammeter (7) and the reading on the voltmeter (8) connected between the second electrode (2) and the third electrode (3) and record it, and complete a On-site single measurement of the water depth position; in order to increase the accuracy of the measurement data, the data displayed on the ammeter (7) and voltmeter (8) can be read and recorded multiple times at a depth; Step 3. Repeat the above two steps to complete the on-site work of resistivity measurement at different underwater depths; Step 4: Calculate the water body resistivity at each test water depth according to the field test record data obtained in the above steps.